Throttle valve



Feb. 9 1926.

L. c. BAY LEs THROTTLEVALVE Filed July 9, 1923 I INVENIOR Lewis abtjylei' %Y Patented Feb. 9 1925..

LEWIS c. BAYLES, or msromrmmvwm, seamless re monsoon-mm cow mm, or msanxorry. mew amass, A consumers}: on new Application filed July 9,

To all whom it may concern:

Be it known that I, LEWIS C. Bums, a citizen of the United States, and e resident of Easton, county of Northampton, and State of Penns lvaniu, have invented e certnin Throttle slve, of which the following is a specification accompanied by drawings. This invention relates to throttle valves for controlling; the passage of pressure fluid through a pipe line or to a machine.

Throttle vslves havin s tapered bodyportion through whic r pressure fluid passes, have a tendency to. be forced so tightl i to their seetsby the pressure fluid, that the y cannot be readily turned unless some means is provided for reducing the prewire along the tapered fit. Lubrication in these valves-is practically impossible as measure fluid soon blows all lubricant froin the hour ing surface. This invention has for its main object the elimination of the above objectionuble features, by producing u valve within which the pressure forcing the valve to its sent is reduced, whereby the valve may be readily turned on and oil and lubrication retained for a; longer period of time.

Further objects of the invention will hereinafter appear, and to all of these ends the invention is illustrated in the nccompmi'ijyin drawings. in which the figure is s vertice section of u valve applied to a rock drill.

Referring to thedrawings, A designates the cylinder of a rock drill in which the differentinl piston i3 is adapt-ed to reciprocate, and to which. cylinder the hackliesd C is secured in any suitable manner. A throttle valve D in the form of a one piece plug, hes a tapered portion E' and fi-Strfllgl lt' or un tapered portion F, and is inserted m the te-. pered'bore (l formed in the hscir head (3. The straight or untapereci portion F oi the valve is squared us at H, and the handle" J is secured thereto in any suitable manner, as by the pin K. A gland nut L is threaded into the hack heed C and has an inwardly tapered bore 0, forming it sent for a swivel member I through which pressure fluid; may pass to the valve D. In this instance, the throttle valve D is formed with a recess Q1, having one end closed; and a lateral port R for admitting motive fluidto the piston B. The pressure against the large end of the to ered valve 1) has a tendency to force the vs vs so tightof air along the intermediate 192a. Serisi no. assess ly into the tapered here G that the lubricent is foicecl out from between the tapered surfaces of the valve and the hose G thus causing the valve to bind, and unless some means is provided for reducing this pressure in some ale ree, it is extremely cliflicnlt to turn the vs vs oft or on, In accordance with the present invention a eireiimferentisl groove S is formed in the tapered portion E of the valve and is in communication vviizh the recess Q, as h means of the pessnge l Instead of the tapered portion of the valve 1) now being forced tightly within the hose G, the pressure is relieved by :2 portion of the pressure iluidpsssing; throngii the passage T to the circumferential. f TGO'VQ The total elietive pressnre on the valve tending to force it into the tapered here 1 is redueed by on amount eqnsl to the cross sectional area of the edge of the groove S multiplied by the unit pressure, while in n valve, in W illCl'l no means is provided forreeinoing the pressure, the total eiieetive pi would be approximately the protinet mien of the large end multiplied by the unit pressure, which is more than twice zis As the pressure st. the large end of the valve D is always equal to the pressure in, the circumferential groove S there is no flow rtion oi the valve tendin to carry the lubricant from thehearing suriece. A circnmierentisi groove U is in this instance formed between i e ts pered ortion E and the straight or no teperei portion F of the vslve for the pair pose of grinding end by means the oir cumferential groove S and pass-ego T, the greater portion of the pressure is taken 21 in the ares between the eircumferenti grooves S and U, so that the i enter arcs of the valve is free to tern ass v, and loss of lubricant materially preven I claim: 1. A throttle vnlve'eomprising e one piece plug having a tepered' hearing portion and a straight beerin portion, a. recess extending pertl throng the plug, it port for pervinitting tie passage of pressnreflnid from the recess, e cireiunfeientisl groove formed on the tapered portion. of the plug hetween the ends of said tapered portion, end a passage through the plug for admitting pressure fluid from the reeess to the groove, thereby redneingthe holding pressure sgeinet the SIS . mam on the tapered portion of the plug are fluid from the between the ends of said to red portion, and a passage throu h the p ug for admitting pressure fluid tom the recess to the groove, thereby reducing the holding pressure against the plug to prevent any lubricant deposited between the plug and its seat from being forced out from therebetween when the plug is closed, and a handle for manipulatlng the lug.

In testimony w ereof I have signed thisv specification.

LEWIS O. BAYLES. 

